# -*- coding: utf-8 -*-

"""

用来测试Python之中的私有和公有方法和变量的特性

由如下的测试可以得知

_xxx:单下划线的方法，变量等，可以被子类访问，它相当于是protected类型

__xxx:双下划线的方法，变量等，不可以可以被子类访问，而且不可以在类定义之外访问，它相当于是private类型的

"""

class PrivateAndPublic():

_name = "zuiguangyin" # 弱内部使用，protected

_age = 24 # 弱内部使用，protected

__address = "重庆" # 私有变量，private

__nickname = "最光阴" # 私有变量，private

def __init__(self, dream):

self.dream = dream

# 私有方法

def _set(self, name, age, address, nickname):

self._name = name

self._age = age

self.__address = address

self.__nickname = nickname

def _get(self):

self.__get() # 只能在内部调用

def __get(self):

print("private method: " + self._name + "," + str(

self._age) + "," + self.__address + "," + self.__nickname + ",")

def print1(self):

print(self._name + "," + str(self._age) + "," + self.__address + "," + self.__nickname + ",")

def print2(self):

print(self.dream)

class PrivateAndPublicChild(PrivateAndPublic):

def __init__(self, dream, timeline):

super().__init__(dream)

self.timeline = timeline

def print2(self):

print(self.dream + ", " + self.timeline)

if __name__ == "__main__":

# 父类

print("======" + "父类")

private_and_public = PrivateAndPublic("have a good life")

print(private_and_public.dream) # 访问成员变量

private_and_public.print1() # 访问成员方法

private_and_public._set("张三", 25, "广州", "狗蛋") # 访问私有方法

private_and_public._get()

# private_and_public.__get() # 无法直接调用

private_and_public.print1()

private_and_public.print2()

# 子类

print("======" + "子类")

private_and_public_child = PrivateAndPublicChild("become a great man", "10")

private_and_public_child.print1() # 这是父类的效果

private_and_public_child.print2() # 访问重写的后的方法

PrivateAndPublic.print1(private_and_public_child) # 调用父类方法

private_and_public_child._get()

# private_and_public_child.__get() # 无法直接调用

print(private_and_public_child.timeline)

print(private_and_public_child._name)

# print(private_and_public_child.__nickname) # 无法直接调用